This is fish farming project in New Zealand, customer need to monitor the pH,ORP,conductivity,salinity,dissolved oxygen,ammonia(NH4). and wireless monitoring on mobile.
Then just use DCSG-2099 Multi-parameters water quality analyzers, it use single chip microcomputer as processor,the display is touch screen,with RS485 Modbus ,USB interface for download data,user just need buy local SIM card to transfer data.

DCSG-2099 Multi-parameters water quality analyzer

Installation site of multi-parameters water quality analyzer

Installation site of multi-parameters water quality analyzer

Installation site of multi-parameters water quality analyzer